angeletti



J. M. ANGELETTI.

TIRE TRIMMER.

APPLicATIoN FILED ocT 10, 191s. RENEWED DEC, |9,192|..

` Patented Mfg; 141,-, 1922,

TIRE TRIMMER.

Application filed October 10, 1919, Serial No.` 329,653. Renewed December 19, 19.531.

Be it known that l, Josnrn M. ANcnLnrri. a subject of the King of Italy, and a resident of New York, in the county of New York and State of New York, lia-ye invented a certain new and useful Improvement in a Tire Trimmer, of which the following is a full., clear, and eXact specification.

This' invention relates more particularly to a class of devices adapted to be used in conjunction with vehicle tires made of rubber.

During the manufacture of the casings or shoes of commonly used pneumatic tires for vehicle wheels it is customary to provide the inner wall of layers of cloth or canvas or interwoven cord, and on the exterior of the tread portion of each inner wall is a layer of vulcanized rubber. The outer surface part of the rubber layer in many types of casings is formed with protrudingshoulders extending lengthwise of the casing in spaced proximity to its clencher flanges. Then taken from the molds following the vulcanizing process these-shoulders of the casing are usually of such irregular or ragged for- .'mations that careful trimming is required,

in order that the finished casing will be neat and sightly ,in appearance. According tov the present methods in use a great deal of time is consumed and skilled workmanship required to accomplish this class of trimming.

My invention has for its object primarily toprovide a device or trimmer designed to overcome these objections by providing a form of blade or cutter having one or more substantially il-shaped cutting edges whereby the irregular parts on the protruding shoulders of the casing may be readily removed, and on the blade at each cutting edge is a guide for causing the blade to be accurately moved during the trimming process as well as serving to prevent accidental cutting or damage tothe tire.

Other objects of the invention are to provide a holder on which the blade is removably mounted, and this handle is of an ad justable typey so that it may be adjusted to various positions to facilitate the work of trimming; and to' provide a trimmer of a simple, eliicient and durable constructionh which may be made in any suitablesize.

, With these and other objects 1n view, the

invention will be hereinafter more fully de-r Specification of Letters Patent.

Patented fling, "i, Serial No. 523,589.

scribed with reference to the arcompanying drawing forming part of this specification in which similar characters of reference iw dicate corresponding parts in all the vif vs, and will then be pointed out in the claims at the end of the description.

In the drawing, Figure ,l is a fragmentary view showing portion of the rubi r casing of a vehicle tire as well as showing the man-` ner of using one form of trimmer embody7- ing my invention for trimming the casing.

Fig. 2 is an enlarged fragment partly in detail and partly in sect.. n, taken vertically through a portion of the device. Fig. 3 is a fragmentary detail sectional view taken on the line 3 8 of 'Fig'. 2.

F ig. Il is an enlarged perspective `view of the blade used in the trimmer, and

Fig 5 is an enlarged fragmentary sectional view taken on the line 5 5 of Fig. la The device or tire trimmer has a blade or cutter 10 which may be of any suitable size and this blade has a Yflat body part 1l of preferably an approximately rectangular shape, and midway of the lengthwise edges of the body part are notches, as l2 and 13. On the'ends of the notched body part of the blade are guides or plates, as 14 and 15, serving to enable the blade'to be accurately moved when trimming a tire, as will behere! inafter more fully explainech and these guides are of similar formations. The guides are preferably made integral with the body part 10 by angularly bending the end parts of a flat strip of metal in somewhat a Z-shape. and 15 are thereby substantially rectangular, and one of the lengthwise edges of the blade may be notched, as at 16, if desired. At the angles or junctures of the guides witlnthe body part 10 and in the edges of the blade opposite to the notches 16 are cutting edges, as 17 and 1S, both of which are j )referably in the forms of approximately 'll-shaped recesses extending crosswise of the blade. The body part 10 of the blade at one of the corners of each of the il-shaped recesses is cut away in an inclined fashion, as at i9, and these inclined parts together with the walls of the recesses are sharpened to keen cutting edges.

In orderjto allow the blade to be conveniently and properly manipulated for` trimming the tire the blade is removably mounted on a holder, as 20. This holder may be rllhe guides or plates lli l 'head 25 are `ister with the pairs of any suitable form, though the one illustrated is composed of a handle 21 of a desired size and shape so that the implement maybe easily held in the hand `of a person, and in a socket 22 provided in one end of the handle is bolted, as at 23, the tong or extends from ahead, as 25. I prefer to make the head and-tang of two corresponding flat plates 26 and 27 which are disposed in lapping arrangement, and the head may be somewhat wider than the tangto provide two shoulders 28 and 29 which abut against the end of the handle. The free ends of the parts of the plates 26 and 27 forming the bent or struck in opposite directions to each other in the form of a forked end 28a with a groove 29a therebetween. The ends oftheparts of the plates 28 and 29 forming the tang 24 interiorly of the handle 21 are held together by the bolt 23, and the parts of the plates forming the head 25 adi jacent to the fork 28 are screwed or bolted together, as at 30 and 31. i

In the Vgroove 29L between the prongs of the fork 28 is pivoted, at 32, one end of an adjustable'clampingelement 33 for detachably carrying the blade or cutter 10. `This clamping element may be of any suitable shape, though the formshown has a partially circular or disklike end 34 which is the portion of the kelement pivoted to the fork 28 so that the element may be `swung angularly with respect to the holder 2O and handle 21. On the other end of the clampingvelement are two approximately ovalshaped complemental jaws 35 and 36 with a transverse slot 37 midway therebetween, and all of these parts of the clamping element are preferably formed of two corresponding plates 37a and 38 whichr are disposedin lapping arrangement. As indicated, the` slot 37 may be provided by grooving the opposed central parts of the plates forming the oval jaws 35 and 36, and the circular end of these plates are Inova-bly held together by the pivot 32, while in spaced registered pairs of holes 38a and 38b in the jaws at the lower and upper edges of the slot 37 are provided removable bolts or,screws 39 and 40. The 'slot 37 is of a width `so that the body part 11 of the blade 10 may be removably accommodated therebetween, and the bolts 39 andy 40 Vare spaced apart at a distance so that when the blade is arranged in the slot the notches 12 and 13 of the blade will engage the shanksofthe bolts.- .The blade 10 is applied to the clamping element 33 by removingl from the jaws 35 and 36 the bolts 39 and 40. One of the platesl 37a and 38 is swung from the other plate. Ther blade 10 is arranged in the slot 37 so that the V-shaped cutting edges 17 and 18 are in opposed relation to the handle `21 and so that the notches 12 and 13 are in regof holes ,38a and ,3 8b of jaws 35 and 36. The plates 37 and. 38

tang 24 which are then rearranged inlapping positions, and the bolts 39 and 40 are reinserted in the pairs ofi registeredholes, besides being tightened, The blade 10 and the clamping element may then be swung angularly relative to the holder 20, and to limit the angular movement of the clamping element-, on the disklike end 34 of the element is a lug 41 which protrudes toward the bottom ofthe groove 29a between the prongs of the fork 28. In spacedfholes at thelower part of the fork 28 are provided bolts or pins 42 and 43 which are disposed across the groove 2 9 of the fork so that the lug 41 of the clamping element is movably disposed therebetween. lhen the blade and the clampingA element 33 are swung angularly relativefto the holder 2O `the lug 41 of the element will contact with one of the pins 42 and 43, and the blade and the element'` will be held in position to allow a person toconveniently use the implement, as shown in 1li .1. 1 f

n practice the implement is preferably employed for trimming the casing or outer cover, as 44, of pneumatic tires such as are commonlyrused on automobiles, trucks, mo-

torcycles and the like, many forms of the casings being made with alengthwise prop truding shoulder, as 45 adjacent to each of its clencher flanges, at 46. During the molding and vulcanizing process in making the casing an irregular or ragged edge, as 47,

remains on each of the` shoulders, and when each shoulder of thecasingv may be readily Y removed by one of thecutting edges ofv the blade 10. i

In the foregoing. deseg'ption, I` have embodied the preferred form of my invention, but I do not wish tofbe` understood as limt-` ing myself thereto, as I am aware that modiications may be made therein without departing from the principle or sacrificing any of the advantages of this invention, therefore I reserve to myself the right tof make such changes as fairly fall within the scope i thereof.

Having thus described my invention, 'I

rclaim as new desire to secure byLet-j ters Patent p 1. Ina tire trimmer, the combination with a holder having a forked head with a handle, of two detachably `connected clamping plates pivoted between `the forks of the head for being swungto angular'positions, and' a blade having am substantially rectangular body l.part removably mounted betweenfthe clamping plates, said blade 'havingv oppo-` sitely disposed angularly bent ends w'thsubstantially ll-shaped notches having cutting edges at the intersections of the body part with the bent ends of the blade.

2. In a tire trimmer, the combination with a holder having a forked head with a han dle, of twoy detachably connected clamping plates pivoted between the forks of the head for being swung to angular positions, and a blade having a substantially rectangular body part removably mounted between the clamping plates, two guide plates protruding angula-rly in opposite directions from the ends of the body, said blade having in one of its edges two substantially ll-shaped cutting edges, one at the intersection of each guide plate with said body part, and sto-psV on the forks of the head for limiting the angular movements of the clamping plates.

3.v A tire casing trimmer including aI blade provided with a substantially V-shaped recess forming opposed cutting edges', a guide member on said blade and arranged at an angle substantially less than a straight angle toy said blade for bearing upon the outer surface of the tire casing between the shoulder and the bead on one side of the casing to guide said blade in trimming said shoulder, and a handle for drawing said blade along the tire casing.

4:. A tire casing trimmer including abla-de provided with a substantially V-shaped recess forming opposed cutting edges, a guide member on said blade and arranged at an angle substantially less than a straight angle to said blade for bearing upon the outer surface of the tire casing between the shoulder and the bead on one side of the casing to guide said blade in trimming said shoul* der, and a handle for drawing said blade along the tire casing, said guide being comparatively thin adjacent the recess so as to provide clearance for the material trimmed from the tire casing.

This specication signed and witnessed this 9th day olf-October A. D. 1919.

JOSEPH M. ANGELETTI. 

